"But that's silly! You can strip it off!"
Of course you can, and you can strip DRM off proprietary DRM schemes too. All of them are cracked. That's not the point. The point is that there's a way for someone to indicate their usage terms along with a piece of media. An OpenDRM would not even necessarily encrypt, or would do so only in a very trivial way. It would instead be a standard for indicating terms of use and automatically checking for licensing entitlements.
In an ideal world we would subsidize content consumption for those who can’t afford it (we already do this via public libraries, and public funding of content creation in many countries, but we should do more) and also more strictly enforce laws against piracy by shutting down torrent trackers. Then we wouldn’t need DRM. But until this pipe dream comes true, I think DRM is valuable.